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238
METALLURGY OF IRON AND STEEL.
TABLE XIII-B. Composition of a 20-inch Steel Roll., Cast in Sand.
Place from -which sample was taken.	Composition; per cent.				
	0.	P.	Mn.	8.	On.
Two inches from outer surface . .......	.42 .51 ,43 .47	.050 .058 .064 .058	.49 .46 ,46 .48	.026 .029 ,026 .096	.12 .11 .10 .14
Five Inches from outer surface    .......					
Seven Inches from outer surface .......					
Nine Inches from outer surface .......					
a cylinder 20 inches in diameter, with a length of 31 feet. A piece four feet long was cut from the top, this amount having been added for a sink-head, and samples were taken at different depths from the outside to the central axis. There were no signs of piping at this point, so that the conditions are not similar to those cited from Potircel, but as the general practice is to remove all the honeycombed portion of such a casting, the investigation is in the line of practical work. The results are given in Table XIII-B.           
TABLE XIII-C. Segregation in Plate Ingots.
Thickness of Ingot In inches.	Part of Ingot from which sample was taken.	Composition ; per cent.		
		Carbon, by combustion.	Phosphorus.	Sulphur.
10	Preliminary test      ..........	und. .1ST .150 .179 .183 .145	.058 .075 .067 .067 .062 .058	.080 .065 .054 .054 .049 .044
	Center, 6 Inches from top ......			
	Center, 12 inches from top ......			
	Center^ 18 inches from top ..... .			
	Center, 24 inches from top ......			
	Center, 8 inches from bottom. ....			
10	Preliminary test ...........	und. .247 .864 .840 .295 .272 .275	.064 .061 .088 .078 .078 .081 .070	.051 .044 .097 .069 .069 .064 .057
	Center, 8 inches from top ......			
	Center, 6 inches from top ......			
	Center^ 9 inches from top ......			
	Center, 12 inches from top ......			
	Center ', 18 inches from top ......			
	Center, 8 inches from bottom ....			
10	Outside, 8 inches from top .....	.185 .278 .212 .205 .199 .159 .164	.007 .007 .008 .008 .008 .007 .007	.018 .029 .034 .034 .029 .017 .020
	Center,    ft inches from top .....			
	Center^    6 inchea from top .....			
	Center', 12 inches from top .....			
	Center J 18 inches from top .....			
	Center',    8 inchea from bottom . . . Outside, 8 inches from bottom . . .			
10	Outside, 8 Inchea from top .....	.160 .280 .199 .213 .208 .184 .185	.054 .096 .084 .090 .090 .066 .066	.035 .067 .060 .068 .071 .042 .081
	Center,    8 inches from top .....			
	CenterJ    6 inches from top .....			
	Center^   9 inches from top .....			
	Center,  12 inches from top .....			
	Center,    8 inches from bottom . . , Outside, 8 Inches from bottom . . .